oom: remove constraint argument from select_bad_process and __out_of_memory

select_bad_process() and __out_of_memory() doe not need their enum
oom_constraint arguments: it's possible to pass a NULL nodemask if
constraint == CONSTRAINT_MEMORY_POLICY in the caller, out_of_memory().

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 10 deletions

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index c29cf00d9084..cba18c06e508 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -284,8 +284,7 @@ static enum oom_constraint constrained_alloc(struct zonelist *zonelist,
  * (not docbooked, we don't want this one cluttering up the manual)
  */
 static struct task_struct *select_bad_process(unsigned long *ppoints,
-                struct mem_cgroup *mem, enum oom_constraint constraint,
-                const nodemask_t *mask)
+                struct mem_cgroup *mem, const nodemask_t *nodemask)
 {
         struct task_struct *p;
         struct task_struct *chosen = NULL;
@@ -301,9 +300,7 @@ static struct task_struct *select_bad_process(unsigned long *ppoints,
                         continue;
                 if (mem && !task_in_mem_cgroup(p, mem))
                         continue;
-                if (!has_intersects_mems_allowed(p,
-                                constraint == CONSTRAINT_MEMORY_POLICY ? mask :
-                                                                         NULL))
+                if (!has_intersects_mems_allowed(p, nodemask))
                         continue;
 
                 /*
@@ -518,7 +515,7 @@ void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask)
         check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, 0);
         read_lock(&tasklist_lock);
 retry:
-        p = select_bad_process(&points, mem, CONSTRAINT_MEMCG, NULL);
+        p = select_bad_process(&points, mem, NULL);
         if (!p || PTR_ERR(p) == -1UL)
                 goto out;
 
@@ -635,8 +632,7 @@ static void clear_system_oom(void)
 /*
  * Must be called with tasklist_lock held for read.
  */
-static void __out_of_memory(gfp_t gfp_mask, int order,
-                        enum oom_constraint constraint, const nodemask_t *mask)
+static void __out_of_memory(gfp_t gfp_mask, int order, const nodemask_t *mask)
 {
         struct task_struct *p;
         unsigned long points;
@@ -650,7 +646,7 @@ retry:
          * Rambo mode: Shoot down a process and hope it solves whatever
          * issues we may have.
          */
-        p = select_bad_process(&points, NULL, constraint, mask);
+        p = select_bad_process(&points, NULL, mask);
 
         if (PTR_ERR(p) == -1UL)
                 return;
@@ -708,7 +704,9 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
                 constraint = constrained_alloc(zonelist, gfp_mask, nodemask);
         check_panic_on_oom(constraint, gfp_mask, order);
         read_lock(&tasklist_lock);
-        __out_of_memory(gfp_mask, order, constraint, nodemask);
+        __out_of_memory(gfp_mask, order,
+                        constraint == CONSTRAINT_MEMORY_POLICY ? nodemask :
+                                                                 NULL);
         read_unlock(&tasklist_lock);
 
         /*